静压法合成金刚石的成核研究  

Research on the Nucleation of Diamond During Static High pressure Synthesis

作　　者：唐敬友[1] 温上捷[1] 董庆东[1] 谷岩[1] 

机构地区：[1]中物院流体物理研究所

出　　处：《金刚石与磨料磨具工程》2001年第2期22-23,共2页Diamond & Abrasives Engineering

摘　　要：针对静高压合成技术中片状样品的组装工艺特点 ,分析了在高温 (约 150 0K)高压 (约 5GPa)下石墨与触媒之间的相互扩散过程和金刚石在合成腔中的成核几率。根据外界提供给石墨的能量大小 ,判断出纳米石墨微晶是形成金刚石晶核的基本单元。金刚石成核很可能是纳米石墨微晶转化为金刚石晶核的结构相变过程。讨论了在触媒的参与下金刚石的成核率与温度压力变化的关系 ,证明了压力是控制金刚石成核的有效参数 ,而温度不宜作为金刚石成核的控制参数。In the light of the peculiarity of synthesis sample assembling mode using plate shape graphite and catalyst alloy under about 1500K temperature and 5GPa pressure, the diffusion process between graphite and alloy as well as diamond nucleation possibilities in synthesis chamber are analyzed. It is judged that nano crystalline graphite can be the basic unit of diamond nucleation in consideration of the energy offered by out side factors. It is likely that diamond nucleation is a phase transformation process from nano graphite into nano diamond. The variation of diamond nucleation ratio with temperature and pressure is discussed. It is indicated that pressure is an effective parameter to control diamond nucleation, while the temperature is not.

关 键 词：静高压合成法 金刚石 成核 成核率 

分 类 号：TQ163[化学工程—高温制品工业]